Biology Paper 1 · B4 · Lesson 4.7
Connect breathing, blood flow and muscle energy demand.
During exercise, muscle cells contract more often and need a greater rate of energy transfer. Heart rate, breathing rate and breath volume increase to supply more oxygen to working muscles.
Breath volume means the amount of air moved in each breath.
No timer. Read the explanation after each answer.
Daily 5 · Core exam practice · Higher Tier questions · A4 revision sheet
Lessons 4.1–4.8 cover the core. Lessons 4.9–4.10 are Higher Tier only. Daily 5 practises core facts.
AQA Combined Science Trilogy specification · 4.4.2.2. Original notes, questions and diagrams. Experimental numbers are illustrative.
Photographs: pondweed by Frank Vincentz; dough by ElinorD, both CC BY-SA 3.0. Polytunnel by Bob Nichols / USDA, public domain. Images displayed without cropping or other alterations.
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